Annular mask lens having diffraction reducing edges

• US 5,905,561 A
• Filed: 06/14/1996
• Issued: 05/18/1999
• Est. Priority Date: 06/14/1996
• Status: Expired due to Term

• Current Assignee: Healthcare Royalty Partners II LP (Toronto-Dominion Bank)
• Original Assignee: PBH Incorporated (Pendrell Corporation)
• Inventors: Legerton, Jerome A., Lee, Chun-Shen, Doshi, Praful C., Evans, John M.
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): SCHWARTZ, JORDAN MARC
• Application Number:
  US08/663,907
• Time in Patent Office: 1,068 Days
• Field of Search: 351/162, 351/163, 351/160 R, 351/160 H, 351/161, 623/6
• US Class Current: 623/6.31
• CPC Class Codes: B29D 11/00038 Production of contact lenses
• CPC Class Codes: B29D 11/00317 Production of lenses with markings or patterns
• CPC Class Codes: B29D 11/00923 on lens surfaces for colouring or tinting printing or marking in general B41M
• CPC Class Codes: G02C 7/16 Shades; shields; Obturators, e.g. with pinhole, with slot G02C5/003 takes precedence

Abstract

Annular mask lens for vision correction having diffraction-reducing edges. The lens body having an annular mask that forms a "soft edge" by gradually decreasing the transmissivity radially from the center aperture to the annular mask area.

Claims

1. A lens adapted to be worn on or implanted in the eye, comprising:

a central portion of selected transmissivity such that the central portion transmits more light energy at a center of the central portion and less light energy toward an outer region of the central portion; and

an annular mask region surrounding the central portion wherein the annular mask region adjacent to the outer region of the central portion has a transmissivity below which the annular mask region functions as essentially opaque, remains at that amount of transmissivity or less for a distance in the range of about 0.5 millimeters to about 4.0 millimeters, then increases in transmissivity until reaching an outer edge of the annular mask region of the lens.

2. A lens adapted to be worn on or implanted in the eye, comprising:

a central portion of selected transmissivity such that the central portion transmits more light energy at a center of the central portion and less light energy toward an outer region of the central portion; and

an annular mask region surrounding the central portion wherein the annular mask region adjacent to the outer region of the central portion has a transmissivity below which the annular mask region functions as essentially opaque, remains at that amount of transmissivity or less for a distance in the range of about 1.5 millimeters to about 2.0 millimeters, then increases in transmissivity until reaching an outer edge of the annular mask region or the lens.

3. A lens adapted to be worn on or implanted in the eye, comprising:

a clear aperture;

an annular portion adjacent to the clear aperture which transmits more light energy at an inner region and less light energy toward an outer region; and

an annular mask region adjacent to the outer region of the annular portion, wherein a part of the annular portion adjacent to the clear aperture provides about 100% transmissivity and wherein the annular portion decreases from about the 100% transmissivity and transitions to the annular mask region and a transmissivity below which the annular mask region functions as essentially opaque, the annular mask region remains at that amount of transmissivity or less for a distance in the range of about 0.5 millimeters to about 4.0 millimeters, then the annular mask region increases in transmissivity until reaching an outer edge of the annular mask region of the lens.

4. A lens adapted to be worn on or implanted in the eye, comprising:

a clear aperture;

an annular portion adjacent to the clear aperture which transmits more light energy at an inner region and less light energy toward an outer region; and

an annular mask region adjacent to the outer region of the annular portion, wherein a part of the annular portion adjacent to the clear aperture provides about 100% transmissivity and wherein the annular portion decreases from about 100% transmissivity and transitions to the annular mask region and a transmissivity below which the annular mask region functions as essentially opaque, the annular mask region remains at that amount of transmissivity or less for a distance in the range of about 1.5 millimeters to about 2.0 millimeters, then the annular mask region increases in transmissivity until reaching an outer edge of the annular mask region of the lens.